#!/bin/bash -e
################################################################################
##  File:  install-haskell.sh
##  Desc:  Install Haskell, GHCup, Cabal and Stack
################################################################################

# Source the helpers for use with the script
source $HELPER_SCRIPTS/etc-environment.sh

# Any nonzero value for non-interactive installation
export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
export BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK=1
export GHCUP_INSTALL_BASE_PREFIX=/usr/local
export BOOTSTRAP_HASKELL_GHC_VERSION=0
ghcup_bin=$GHCUP_INSTALL_BASE_PREFIX/.ghcup/bin
set_etc_environment_variable "BOOTSTRAP_HASKELL_NONINTERACTIVE" $BOOTSTRAP_HASKELL_NONINTERACTIVE
set_etc_environment_variable "GHCUP_INSTALL_BASE_PREFIX" $GHCUP_INSTALL_BASE_PREFIX

# Install GHCup
curl --proto '=https' --tlsv1.2 -fsSL https://get-ghcup.haskell.org | sh > /dev/null 2>&1 || true
export PATH="$ghcup_bin:$PATH"
prepend_etc_environment_path $ghcup_bin

available_versions=$(ghcup list -t ghc -r | grep -v "prerelease" | awk '{print $2}')

# Install 2 latest Haskell Major.Minor versions
major_minor_versions=$(echo "$available_versions" | cut -d"." -f 1,2 | uniq | tail -n2)
for major_minor_version in $major_minor_versions; do
    full_version=$(echo "$available_versions" | grep "$major_minor_version." | tail -n1)
    echo "install ghc version $full_version..."
    ghcup install ghc $full_version
    ghcup set ghc $full_version
done

echo "install cabal..."
ghcup install cabal latest

chmod -R 777 $GHCUP_INSTALL_BASE_PREFIX/.ghcup
ln -s $GHCUP_INSTALL_BASE_PREFIX/.ghcup /etc/skel/.ghcup

# Install the latest stable release of haskell stack
curl -fsSL https://get.haskellstack.org/ | bash

invoke_tests "Haskell"